4. A two-stage cascade cooling system operates between thepressure limits of 1 and 0.1 MPa. Each stage operates on the idealvapor compression cooling system and the refrigerant R-134a is usedas working fluid. The heat transfer from the lower to the uppercycle takes place in an adiabatic reverse flow heat exchanger whereboth streams enter about 0.4 MPa. The refrigerant mass flow rate is0.24 kg / s throughout the upper cycle.
a. sub-loop mass flow rate of refrigerant
b. heat extraction rate and compressor input power from chilledarea
c. Determine the COP value.
